How come inner circle radius is 5 ?

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Line $AB$ is $24$ metres in length and is tangent to the inner one of the two concentric circles at point $C.$ Points $A$ and $B$ lie on the circumference of the outer circle. It is known that the radii of the two circles are integers. The radius of the outer circle is

- $13$ m
- $5$ m
- $7$ m
- $4$ m

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